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Finding the Fourth Proportional to 389,639.36, 537,697.08 and 217,560

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Solution

The fourth proportional to 389,639.36, 537,697.08 and 217,560 is: 300,229.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,639.36 : 537,697.08 = 217,560 : x
  2. Step 2: Convert to fraction form
    389,639.36/537,697.08 = 217,560/x
  3. Step 3: Cross multiply
    389,639.36x = 537,697.08 × 217,560
  4. Step 4: Simplify right side
    389,639.36x = 116,981,376,724.80
  5. Step 5: Solve for x
    x = 116,981,376,724.80/389,639.36
  6. Step 6: Final answer
    x = 300,229.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.